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Income Taxes - Narrative (Details) - USD ($)
12 Months Ended
Nov. 05, 2015
Nov. 04, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]          
Release of valuation allowances     $ (57,830,000) $ (2,949,000) $ 17,520,000
Insurance company investments     86,811,000 99,645,000  
Foreign operating loss carryforward     50,151,000 $ 54,642,000  
Net operating losses subject to expiration     146,200,000    
Operating loss carryforwards     46,100,000    
Amount subject to annual limitation     77,800,000    
Operating loss carryforward limitation     2,300,000    
Foreign Tax Authority          
Operating Loss Carryforwards [Line Items]          
Foreign operating loss carryforward     297,400,000    
Net operating losses subject to expiration     1,100,000.0    
United Kingdom          
Operating Loss Carryforwards [Line Items]          
Foreign operating loss carryforward     230,100,000    
Internal Revenue Service (IRS)          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards     95,300,000    
Common Equity          
Operating Loss Carryforwards [Line Items]          
Issuance and sale of common stock (in shares) 8,452,500 8,452,500   8,459,000 1,500,000
Domestic Tax Authority          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards     $ 21,600,000